76 lines
2.4 KiB
JavaScript
76 lines
2.4 KiB
JavaScript
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/*
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Copyright 2009 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @fileoverview template.js contains the implementation for a simple template
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* scheme. Templates are fragments of HTML containing patterns into which
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* arguments will be substituted.
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*/
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google.wspl.simplenotes = google.wspl.simplenotes || {};
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/**
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* Template class constructor. A template is an object which will
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* substitute provided parameters into a marked-up string.
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* @param {string} template
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* @constructor
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*/
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google.wspl.simplenotes.Template = function(template) {
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this.template_ = template;
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this.res_ = null;
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};
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/**
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* Returns the template expanded with the given args where args
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* is an object (acting as an associative array) binding keys (found
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* in the template wrapped with % symbols) to the associated
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* values.
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*
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* Template substitution symbols without corresponding arguments
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* will be passed through unchanged to the output.
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*
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* We assume that in typical use, the same template will be expanded
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* repeatedly with different values. In this case, storing and re-using
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* previously generated regular expressions will provide a performance
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* improvement.
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* @param {Object} args associates names with values
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* @param {boolean} opt_rebuild set to true to force re-building the
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* the regular epxression.
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*/
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google.wspl.simplenotes.Template.prototype.process = function(args,
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opt_rebuild) {
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var rebuild = opt_rebuild || false;
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if (rebuild || this.res_ == null) {
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var accumulatedRe = [];
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this.res_ = null;
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for (var a in args) {
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accumulatedRe.push('%' + String(a) + '%');
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}
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if (accumulatedRe.length > 0) {
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this.res_ = new RegExp(accumulatedRe.join('|'), 'g');
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}
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}
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if (this.res_ != null) {
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return this.template_.replace(this.res_, function(match) {
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var keyName = match.slice(1,-1);
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return args[keyName];
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});
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} else {
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return this.template_;
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}
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};
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